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arXiv 1206.6587nucl-th
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相对论性重离子碰撞中冻结态强子的局域各向异性动量分布

Locally anisotropic momentum distributions of hadrons at freeze-out in relativistic heavy-ion collisions

Maciej Rybczyński, Wojciech Florkowski

摘要:

在强子产生的统计模型中实现了一个各向异性的球型局域动量分布。我们表明,这种形式导致完全相同的比例的强子丰度的平衡分布,如果温度是确定的特征横动量尺度。此外,一个很好的近似的横向动量谱的强子是相同的各向同性和各向异性的系统,提供了系统的大小在冻结出适当的调整。我们进一步表明,这种不变性可以用来提高模型和实验HBT结果之间的协议。

英文摘要:

A spheroidal anisotropic local momentum distribution is implemented in the statistical model of hadron production. We show that this form leads to exactly the same ratios of hadronic abundances as the equilibrium distributions, if the temperature is identified with a characteristic transverse-momentum scale. Moreover, to a very good approximation the transverse-momentum spectra of hadrons are the same for isotropic and anisotropic systems, provided the size of the system at freeze-out is appropriately adjusted. We further show that this invariance may be used to improve the agreement between the model and experimental HBT results.

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